Electrical switch



F. W. SANFORD.

ELECTRICAL SWTGH.

APPLIUATION FILED JULY 24,1908.

Patented Apr. 27, 1909.

2 SHEETS-SHEET 1.

TU. Z

. 4 n I// m. m m VLM, K

J y E I'. W. SANFORD. ELECTRICAL SWITCH.

APPLIoATIoN FILED JULY 24, 1908.

Patented A131227, 1909.

2 SHEETS-SHEET 2.

UNITED STATES PATET oFFIoE.

FRANRW sANFoRmoF oHIoAeo, ILLINOIS, Assioaoa or oN |.Ii.\i.1ii11o .HERBERT oiwurl,

OF BURRAGE, MASSACHUSETTS.

ELECTRICAL SWITCH Specification of Letters Patent.

Patented April 27, 1909.

Application led July 24, 1908. Serial No. 445,208.

*Tosfall 'whom 'it may concern:

itknown that I, FRAN 1i WV. Sais-Folin, a' 'citizen of the UnitedSta-tes, residing at Chicago; 'county' of Cook, and State of Illinois, have invented an Improvement in AElectrical Switches, of'which the followingl descriptiomin connection with. -the accompanyngfdraWng, is :n.specification, like tuating springis being wound up.

I have' herein illustrated my invention as embodied in a so-'called iush switch which has two push buttons,.one for opening the Switch and the other for closing the switch,v although my invention is not confined --tota switch of this character but may be embodied in other snap switches..

In the drawings wherein I have shown such a Hush switch, Figure 1 isla to plan View of the plate or cover thereof; F 1g. 2 is msection on-an enlarged scale through the switch; Fig. 3'is a partial section 'similar tol F ig. 2 showing the push buttons partially operated, 'casing being omitted in said fguregFi 4 is a side View of the parts showny inig. 3; Fig. 5 is a section on the line .1v-a', Fig. 4; Fig. 6 is a section on the vline y-y, Fig. 4; Fig. 7 is a view similar to Fig. 6 showing the manner in which the stop acts to limit the rocking movement of the switch-bladecarrying member; Fig. 8 is a section on the line a-a, Fig. 7.

In the switch herein shown 3 and 4 are theswitch contacts, -5 and '6 are the switchblades which are carried by a switch-bladecarrying member 7; that is rotatably mouiit- .34 depending from the face plate 16. The

shaft 8 has mounted thereon 'a rocker 12 provided with a laterally-extending@projection. 13 which is also Vreceived between'the .two,ends 1,0-of the spring =11. This rocker has connected to o posite sides thereof two plungers 11i carrying the push-buttons 15 which extend inrough the tace plate, '1G otl the device. 'lhc contacts il and l areI supported il a box or casing 17 which is adapted to be set into the wall, the tace vplate 1G coming iush with the surface of the wall as usual in [lush switches ot' this'charactcr. When either push-button l5 is depressed. the rocker 13 is turned and the projection ot' ll-thcrcb)v winding said spring up and the resiliency ot' the spring acts through the other end 1() on the projection 9 to turn the .switch-bl:ale-carrying member 7 as usual in this class ot devices. ly depressing one of the push-buttonsI l5 the switch blades 5 and (3 are thrown linto engagement with the contacts $3 and l Athereb)y closing the switch and by depressing the other button l5, the switch-blacle-carrying 1ueu1ber7 is turned to diseugage the switch blades 5 and (from the contacts 3 and 4, thusopening the switch.

The parts thus far described may be and are all. as usual in iiush switches of this character and form no part of lmy present invention.

In a device of this' character it is desirablethat the contact between the switch blades and the switch contacts should be made and broken with a quick movement, and my invention relates particularlyto the device for restraining the movement of the switch-blade-carrying member while either push-button is being depressed and until the spring 11 has been Wound up and then releasing said member 7 to permit it to have a quick movement. In the present invention this is accomplished by making rigid with the sWitcli-blade-carrying member a plate 20 having extending therefrom two stop projections 21 and by providing the plungers 14 with the abutment flanges 22 which extend inwardly sufficiently-to overlie the projections 21. Thel relation between the projections 21 andthe abutment flanges 22 is such that when either push-button is depressed, the abutment flange corresponding thereto stands in thepath of movement A of the adjacent projection 21, as seen clearly in Figs. 3, 6, 7 and. 8, and thus said flange 22 acts as a stop to prevent the movement of the plate 20' and consequently of the switchblade-car'r'ying member. The depressing of thelpush-button; however, turns' the rocker 12 and through the arms 13 acts on one end of the spring 10 to wind said spring up, .the

.the rocker acts ou one cull l() of the spring other end of said spring being held from movement by its engagement with the pro jection 'which is restrained in its Inovement bythe fact that the-'stop 2l .is against the abutment fiange 22, as shown 1n Flgs; 3 and 7. The flange 22 is of such a len th, as

.slio'wn in Fig. .7, that when 'the push# utton scribed operationr transpires when either of the push-buttons 1.5 is depressed. This` makes a very simple device for accomplishing this'purpose. In thepresent embodiment the projection 9 'is integral. with the plate 20, and the end of the projection is made fast to the member 7 so. that said member 7 and the plate 20 turn in unison. This construction, however, is not essential to the invention. The hanger or bracket 34 is show n as provided with two shoulders 35 situated to engage the projection 9` and thereby limit the turning movement of the switch.

Having fully` ydescribed my invention,

' what I claim as-new'and desire topsecureby rocker, each plunger having an abutment liange, and two stops rigid with the switchbladecarrying member to engage 'said Harige.

2. In a switch, the combination with a switchbladecarrying member, 'of a spring for actuating said member, 'av rckerfor placing the spring under tension, two plungers carrying push-buttos fbr actuating the rocker, eachv plunger having an abutment Hang-e, .a plate rigid with the switch-bladecarrying member and provided with two:

projections coperating with the abutment flanges to restrain the movement of said member until each plunger has been fully depressed. y

In testimony whereof, I have signed my name to this specification, in the presence of two' subscribing witnesses.l

i FRANK WV. SANFORD. Wvtnesses: I

LOUIS C. SMITH,

THOMAS JQ DRUMMOND. 

